Research On Resonant Electro-Hydraulic Vibrator

With the rapid development of modern technology, particularly in the areas of aerospace, performance requirements of electro-hydraulic vibrator get higher and higher. Not only needed to reach higher working frequency, it is also needed to have a large exciting force output.The frequency bandwidth of conventional electro-hydraulic exciter is always limited to a rather narrow range. This restriction is attributed not only to the limited response capability of the servo valve but also to the electro-hydraulic servo system itself, the bandwidth of which is unable to be extended. Thus,2D-valve is used to control electro-hydraulic vibration exciter to achieve high-frequency electro-hydraulic excitation. But with the increase of excitation frequency, the amplitude of the vibration load dramatically attenuated. So it’s difficult to take into account the existence of the excitation frequency and the amplitude of the vibration load. Inspired by the mechanical resonant and electromagnetic resonant vibration exciter, we propose the design of resonant electro-hydraulic exciter. It resonates in the working frequency band by changing the natural frequency of the resonant electro-hydraulic exciter, and the resonance energy can enhance the amplitude of the vibration load. The main research works and results of this paper are as follows:1) The structure of single rod cylinder controlled by three-way2D-valve is applied to resonator electro-hydraulic exciter to solve the problem that the traditional vibration amplitude of the exciter with the rise of the excitation frequency will attenuate with the rise of the excitation frequency. And we need to design structures of the three-way2D-valve and single rod cylinders.2) To analysis the principle of the electro-hydraulic valve controlled by2D valve, and to establish the mathematical model of the electro-hydraulic exciter3) To research and analyze the resonance mechanism, and to come to the integrated natural frequency of the system by the establishment of the function passed through the system. Comparing the change of the energy at the time when the system resonance occurs by simulation analyzing the output waveform of the centrifugal force of the exciter systems when working around the inherent frequency bands.4) To establish a test platform. By changing the operating frequency of the exciter, to find resonant frequency of the system, and comparing output waveform of the exciting force at the excitation frequency from low to high to draw a conclusion that the system has a higher resonant energy when working at the resonant frequency. In addition, we get a conclusion that the resonant frequency of the excitation system can be changed with the changing of the volume of the rodless cavity of the hydraulic cylinder.